JPH0242960Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to piping for low-temperature liquids such as LNG, etc.
This relates to a low-temperature liquid safety device that, in the event that low-temperature liquid leaks from a tank or vaporization installation, temporarily stores the leaked low-temperature liquid in a storage tank and recovers it later.

[Prior Art and Its Disadvantages] Fig. 2 shows a conventional low temperature liquid safety device, which consists of a low temperature liquid storage tank 01 and a gravel tank 02 with gravel 05 placed in the bottom configured next to it. The low-temperature liquid that has flowed into the low-temperature liquid storage tank 01 from the conduit 03 flows from this tank 01 through the pipe 04 into the gravel tank 02, and due to the blocking action of the tip of the pipe 04 due to the freezing of the gravel 05, the low-temperature liquid is It is stored in the storage tank 01. Therefore, it is necessary that the gravel 05 in the gravel tank 02 be kept in a state where it is frozen by cold heat, that is, kept in a constantly moist state. Conventionally, therefore, patrol monitoring was required, with security personnel checking to see how dry the gravel 05 was, and if it was dry, opening the manual pot from the water injection pipe 06 and injecting water into the interior. As a result, costs for security management increased, and there was a risk that the low-temperature liquid could not be stored in the low-temperature liquid storage tank 01 in the event that the gravel 05 was dry.

Furthermore, when rainwater enters the low-temperature liquid storage tank 01 from the conduit 03 and flows into the gravel tank 02, this rainwater is drained out of the tank via the drain pipe 07. If the inlet of the pipe 07 became clogged, the inside of the gravel tank 02 would be filled with rainwater, which would overflow into the surrounding area.

[Purpose of the present invention] The present invention is proposed in view of the above points.
The purpose is to propose a low-temperature liquid safety device that does not require patrol monitoring and is less likely to cause rainwater to overflow.

[Structure of the present invention and its operation] The configuration of the present invention is as follows.

In an installation location where there is a sand layer underground and the groundwater level is above this sand layer, a low temperature liquid storage tank is installed at the end of the low temperature liquid conduit, and a drainage pipe is extended from the bottom of this low temperature liquid storage tank into the sand layer. A cryogenic liquid safety device provided with

In the above security device, when the low temperature liquid flows into the low temperature liquid storage tank from the conduit, the low temperature liquid immediately flows out into the gravel layer through the drain pipe. When the cold liquid flows into the gravel layer, this gravel layer is within the groundwater table;
Because the water is constantly wet, the area near the tip of the drain pipe freezes quickly, blocking the drain pipe. As a result, all the cryogenic liquid is stored in the cryogenic liquid reservoir. or,
In the case of rainwater, it percolates into the gravel layer without limit and does not accumulate in the low-temperature liquid storage tank.

[Embodiment and its operation] FIG. 1 shows an embodiment of the present invention, in which 1 indicates a conduit 2.
A drain pipe 5 is installed extending from the bottom 1' of the low temperature liquid storage tank 1 to the sand layer 4 below the groundwater level 3.

Note that the safety device according to the present invention is required to be installed at a location where there is a groundwater level and a sand layer below the groundwater level. However, since most storage bases or vaporization facilities for LNG etc. are installed on the coast, the present invention can be applied in most cases.

In the above embodiment, from the conduit 2 to the low temperature liquid storage tank 1
When, for example, LNG flows into the sand layer 4, this LNG immediately flows out from the drain pipe 5 into the sand layer 4 and freezes the surrounding sand. When the surrounding sand freezes, the drain pipe 5
Since the tip 5' of the drain pipe 5 is closed, no more LNG will seep out from the drain pipe 5, and the LNG will be stored in the low-temperature liquid storage tank 1. The LNG once stored will be recovered later.

Further, rainwater flowing into the low temperature liquid storage tank 1 from the conduit 2 percolates into the sand layer 4 through the drain pipe 5 without restriction.

[Effects of the present invention] As described above, in the case where the safety device is installed under the groundwater level and sand layer, the present invention installs the drain pipe by extending it from the bottom of the low-temperature liquid storage tank to the sand layer. In this case, the sand layer is always in a wet state, so there is no need for patrolling and monitoring as in the past, and security costs can be saved, and the security device is extremely simple compared to the past. Furthermore, since the tip of the drain pipe is always in a wet state, the drain pipe can be reliably blocked when low-temperature liquid flows into the drain pipe.

Next, even if a large amount of rainwater flows in, the sand layer absorbs it without limit through the drainage pipe, so there is no need to worry about rainwater at all.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a cryogenic liquid safety device according to the present invention, and FIG. 2 is an explanatory cross-sectional view of a conventional security device. 1... Low temperature liquid storage tank, 2... Conduit, 3... Groundwater level, 4... Sand layer, 5... Drain pipe.

Claims (1)

[Scope of utility model registration request] In installation locations where there is a sand layer underground and the groundwater level is above the sand layer, a low temperature liquid storage tank is installed at the end of the low temperature liquid conduit, and a drainage pipe is extended from the bottom of this low temperature liquid storage tank into the sand layer. A cryogenic liquid safety device provided with